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practice problems solutions1

# practice problems solutions1 - SinglePhasecircuit 1 For...

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1) Fo av ݒ ݒ or each follo verage powe ൌ 277√2 sin ൌ െ170 sin owing load v r absorbed. nሺ377ݐ ൅ 30 ሺ377ݐ െ 30 Single voltage and c ሻ ܸ; ݅ ൌ ሻ ܸ; ݅ ൌ 8 e Phase circu current pair 5.1√2 sinሺ3 8.1 cosሺ377ݐ it find the cor 377ݐ െ 10 ݐ ൅ 30 ሻ ܣ rresponding ܣ power facto r and

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2) A p A factory draw laced across lso, what are ws 100 A at a the line at t the final cur 0.7 lagging p he input to t rent for the f power factor the factory in actory, capac from a 12.47 ncreases the citor and line? 7 kV, 60 Hz lin overall powe ? ne. What cap er factor to u acitor unity?
Three phase circuit 1) Find the phase currents I BC , I AB , and I CA of a balanced three phase Δ‐ load to which one line current is I B = 50 ס 40 0 A. The phase sequence is ABC. 2) A balanced Y of 20 ס 20 0 impedances and a balanced Δ of 42 ס 30 0 impedances are connected by three wires to the secondary of a three phase transformer. If V BC = 480 ס 10 0 V and if the phase sequence is ABC, find the total phasor line currents.

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Transformer 1) Consider a 1 ‐ φ , 10 kVA, 2200/220 V, 60 Hz transformer. Determine the voltage regulation in

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